The Norwegian dog was an Alaskan Malamute owned by the Norwegian Antarctic research station. The assimilated animal originally appeared in the 1982 film The Thing portrayed by the late wolfdog actor, Jed. Its origins were further explored in the 2011 prequel of the same name.
The Thing (2011)
The Norwegian dog's background is explored in the 2011 prequel to John Carpenter's The Thing. It is shown to be (presumably) Thule Station's sole dog, owned by Lars. It is attacked by the original Thing after it escapes from its ice block and rampages through the outpost. The dog is later found in a bloody mess in the corner of it's cage by several Norwegian team members during their search for the Thing. Due to their ignorance of the Thing's life-cycle, the dog's remains were left alone by the crew and its whereabouts were largely unknown throughout the Thule crisis. It is only at the end of the film that the dog, now assimilated, is seen by Lars leaping out of a window and running away from the destroyed station. He recognizes that it is an imitation and pursues the Kennel-Thing across Antarctica with helicopter pilot, Matias - eventually reaching American research station, Outpost 31 in 1982's The Thing.